Ammonia-compressor



E- AUGUST-IN AND G. BAUER.

AMMONIA COMPRESSOR.

APPLICATION FILED JUNE 29.1920.

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Patented Nov. 22, 1921.

2 SHEETS-SHEET I.

QD M/UZAAXOW EdwinlAu us'fin [3E0 r52 Bauer E. J. AUGUSTIN AND G. BAUER.

AMMONIA COMPRESSOR.

APPLICATION FILED JUNE-Z29. 1920.

1,397,9 1 4. Patented Nov. 22, 1921.

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Edwin J- Aususfin alinement with the necessary UNITED STATES EDWIN J. AUGUSTIN, OF HAUWATOSA,

PATENT @FFEQE.

AND GEORGE BAUER, OF MILWAUKEE WISCONSIN.

AIEMONIA-COMPR-ESSOR.

To all whom it may concern:

' Be it known that we, Eowiiv J. AUeUsTiN and GEORGE BAUER, both citizens of the United States, and residents of W'auwatosa, in the county of Milwaukee and State of \Visconsin, and 657 28th St, Milwaukee, Wisconsin, respectively, have invented. certain new and useful Improvements in Ammonia-Compressors; and we do hereby declare that the following is a full, clear, and exact description thereof.

Our invention relates to new and useful improvements. in fluid compressors and has particular application to ammonia compressors for use in refrigerating apparatus.

One of the important objects of this vention is to provide a small, compact high pressure compressing unit for ammonia and similar fluids which can be relatively inexpensively manufactured and the parts of which can be quickly and easily assembled or disassembled.

Another object of the invention is to provide a compressor of this type having a pair of opposed cylinders in which smooth pistons reciprocate. That is to say it is our purpose to use pistons without the usual packing rings and to provide an improved packing means which will absolutely prevent the escape of ammonia and the like out of the cylinders and into the crank case. This is not only more conducive to efficient operation of the compressor, but also permits the parts to be manufactured at a less cost and to be more readily assembled.

It is a further object of the invention to provide a pair of opposed rigidly connected pistons having an improved means for reciprocating the same, it being a subsidiary object thereto to provide a novel reciprocating means whereby the crank case and other parts of the compressor may be made on a relatively small scale and very compact.

It is likewise'an object of the invention to provide a bearing means for the crank shaft which, while supporting only one end portion, will effectively hold the same in stationary connection possibility parts, means being provided in therewith for also eliminating the pf leakage of oil or any other fluid from the interior of the crank case to the outside thereof through the crank shaft bearings.

With these and other objects in view, the

invention resides in the novel features of Specification of Letters Patent.

' Patented Nov. 22, 1921. 1920. Serial No. 392,639.

construction, combination and arrangement of parts which will be hereinafter more par ticularly described and claimed, and shown in the accompanying drawings, wherein-- Figure 1 represents a vertical longitudinal sectional view through the opposed compres sion cylinders and the crank casing, of a compressor/said section being taken on the plane of the line 1-1 of Fig. 2, and,

Fig. 2 is a transverse section on theplane of the line 2 2 of Fig. 1..

Referring more particularly to the drawings, the reference character 1,.denotes a crank case having a usual supporting base 2 and an opening 3 extending through one side wall whereby access may be to the interior thereof for assemblying the parts located therein, this opening 3 being closed by a cover plate 4. The side of the crank case 1 opposite the opening3 and substantially alined therewith hasa bearing opening surrounded by a bearing sleeve 5, said sleeve being extended internally as well as externally of the crank case wall.

A crank shaft 6 is journaled in the bearing obtained sleeve 5, the same having bearing members 7 and 8 located at the inner and outer ends thereof respectively to support the shaft.

Inasmuch as the bearing sleeve 5 is relatively long, and is substantially the length of the shaft 6, it is obvious that the latter will be effectively journaled and held in alinement with the necessary parts of the compressor. The portion of the sleeve 5 intermediate the bearing members 7 and. 8 is provided with suitable packing to prevent the fluid from leaking from the crank case 1, this sleeve having a shoulder 9 against which compressible composition packing or packing rings 10 are dispose A helical spring 11 having fiat convolutions is disposed around the intermediate part of theshaft 6 and has one end bearing against the packing 10 or against a wear plate 12, the other end of said spring being in contact with an adjustable collar 13. The outer end portion of the bore of the sleeve 5 and this collar 13 are screw threaded whereby the latter can be adjusted inwardly or outwardly'of the sleeve and thus vary the tension of the spring 11. By such a means the packing 10 is always retained in effective with the shoulder 9 and the shaft 6.

That portion of the shaft 6 which extends beyond the outer end of the sleeve 5 carries cooperation a pulley or other drive wheellet, whereas the inner end, or that portion within the crank case l'has a crank 15 extended therefrom.

It will be noticed that the end of the crank opposite to that connected with the shaft. 6 is free, and consequently the entire crank shaft is supported by the bearing. members 7 and 8. As a result the crank case 1 can be made comparatively narrow, that is tosay tially rectangularand is formed of a pair of approximately U-shaped members 19, each of which is carried. byvthe .inner part of a piston 20.

Thus the x and dispose in opposed relation for operation in opposed cylinders 21. Each of the cylinders 21 is preferably detachably connected with an end wall 22 of the crank case 1, which end walls have alined openings 23 thatare likewise alined with the cylinders 21. The bores of the openings 23 and likewise the' adj acent portion of the bores of the cylinders 21 are somewhat larger in diameter than the main part of the cylinder to provide annular shoulders 24:. Seated against the shoulders 24 are suitable packing rings or other composition packing 25 simi lar to the packing 1O hereinbefore described. Also as in the case of the first mentioned packing, the same is retained in effective cooperation with the shoulders24'and the pistons 20 by eXpa-nsile helical springs 26.

These springs 26' have their convolutions flatv and one endbears against fthepacking 25 or a wear plate and the other end against an adjustable collar 27. These collars 27 are threaded into the bores 23 to permit the tension of the springs 26 to be readily varied. A packing of this nature eliminates the necessity for piston rings and permit the pistons to be formed with a smooth cylindrical surface. Therefore, the wear on the cylinder walls and the' surfaces of the pistons h is reduced to aminimum. Likewise with this type of packing there is practically no likelihood of the ammonia, which normally escapes quite readily into the crank case,

leaking from the compression cylinders;-

As is usual in machines of this character,

- the compression cylinders 21' are provided with inlet and outlet valves 28 and 29 re-;

spectively. In order to ture and at the same time provide an efli- (pistons 20 are rigidly connected cheapen the cost of manufaccient and practical device wherein the cylinders and valve seats are accurately ground so that there is no chance for leakage of ammonia, we have devised a structure wherein the cylinder and the pockets for the valves connected therewith are cast in one piece. The outer end of the casting is provided with a bore, as shown at 30, somewhat larger than the bore of the cylinder and in alinement therewith but beyond the path of the piston, thus forming a pocket with an annular shoulder 31 on which is seated the cage 32 which carries the valve 28. Thus ready access-may be had for grinding the cylinder 21 as well as the pocket 30. The cage is secured in the pocket by the cap 33 which is readily removable when it is necessary to repair or renew the valve, as well as providing a convenient and practical means for quickly assembling the parts of the device. The seat and pocket for the valve 29 may be readily bored from the side of the casting and the valve may be readily assembled or removed by reason of the removable cap 34.-

The above described structure of the cylinder and valves results in a great saving of expense in manufacture while atthe same time allowing for an accurate grinding of the parts. The valve cage 32 has an inner diameter substantially the same as that of A device of the character described, comprising a crank case, a pair of opposed cylinders extending in opposite therefrom, a pair of pistons reciprocably mounted in said cylinders, a borein each directionsv cylinder casting, in alinement with but larger than the cylinder bore and beyond the path of the piston, and forming with said cylinder bore an annular shoulder, a valve cage fitted into said larger bore and seated on said shoulder and having an inner diameter substantially equal to that of the cylinder, a capremovably securing said cage in position and having an inlet port the side wall of the cylinder.

In testimony that we claim the foregoing we have hereunto set ourhands at Milwau kee in the county of'Milwaukee and State of Wisconsin.

EDWIN J. AUGUSTIN; GEORGE BAUER.

therein, an inlet valve seated in the inner 3 

